Steam condensate corrosion
Steam condensate corrosion
(OP)
We have a carbon steel line that is experiencing steam condensate corrosion. We are primarily seeing it at socket welded connections. Any idea why? This condensate is the return from steam tracing used to keep Coker instrument gages from plugging up.
Also, if I were to upgrade, would upgrading to type 405S stainless pipe be a good alterntative to Type 304. I am trying to avoid chloride SCC.
many thanks
Also, if I were to upgrade, would upgrading to type 405S stainless pipe be a good alterntative to Type 304. I am trying to avoid chloride SCC.
many thanks





RE: Steam condensate corrosion
Moving to a steel grade with jsut a bit of Cr may be all that you need.
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RE: Steam condensate corrosion
RE: Steam condensate corrosion
RE: Steam condensate corrosion
RE: Steam condensate corrosion
The partial pressure of CO2, pH and temperature are critical factors.
Increasing partial pressures of CO2 result in lower pH condensate and higher rates of corrosion.
Corrosion occurs in the liquid phase, often at locations where CO2 condenses from the vapor phase.
luis
RE: Steam condensate corrosion
1) neutralizes acidity (from CO2 in air from vacuum breakers & vents), and
2) forms a protective film on the ferrous metals.
I recall cyclohexylamine may attack copper and copper alloys, but there are other chemicals available, depending on your steam system:
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